package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;

import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

public class ConsumerQuickStart {
    public static void main(String[] args) {
        //1.kafka配置信息
        Properties prop = new Properties();
        //1.1设置kafka的连接地址
        prop.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.135.128:9092");
        //1.2key和value的反序列化器
        prop.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        prop.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        //1.3.设置消费者组
        prop.put(ConsumerConfig.GROUP_ID_CONFIG, "group2");

        //手动提交偏移量
        prop.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);

        //2.创建消费者对象
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(prop);
        //3.订阅主题
        consumer.subscribe(Collections.singletonList("zcfe-topic-out"));
        //4.拉取消息-----设置频率这里为没秒拉取一次
        //同步和异步组合提交偏移量

        try {
            while (true) {
                ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                    System.out.println("拉取消息的key值为：" + consumerRecord.key());
                    System.out.println("拉取消息的value值为：" + consumerRecord.value());
                    System.out.println("偏移量：" + consumerRecord.offset());
                    System.out.println("消费者所在分区(默认为0)：" + consumerRecord.partition());
                }
                //异步提交偏移量
                consumer.commitAsync();
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("记录错误的信息："+e);
        }finally {
            //同步提交偏移量
            consumer.commitSync();
        }

        /*while (true){
            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                System.out.println("拉取消息的key值为："+consumerRecord.key());
                System.out.println("拉取消息的value值为："+consumerRecord.value());
                System.out.println("偏移量："+consumerRecord.offset());
                System.out.println("消费者所在分区(默认为0)："+consumerRecord.partition());

                //同步提交偏移量
                try{
                    consumer.commitSync();
                }catch (CommitFailedException e){
                    System.out.println("记录提交失败的异常："+e);
                }

                //异步方式提交偏移量
                consumer.commitAsync(new OffsetCommitCallback() {
                    @Override
                    public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
                        if (e!=null){
                            System.out.println("记录错误的提交偏移量："+map+"异常信息为："+e);
                        }
                    }
                });

            }
        }*/

    }
}
